An atom 17 protons, 17 electrons and 18 neutrons has a mass number of? By: Sunday|Published on: Aug 22|Categories: Chemistry WAEC| 0 comments A. 17 B. 18 C. 34 D. 35 E. 52 Correct Answer: Option D – 35 Users Also Read These:The nucleon and proton numbers of a neutral atom of…A particle that contains 9 protons; 10 neutrons and…A particle that contains 9 protons, 10 neutrons and…A particle that contains 11 protons; 12 neutrons and…The nucleon number and the proton number of a…SEE ALSO Dry hydrogen chloride when dissolved in methylbenzene?